Temperature and Pressure Relief Valve Inlet Type MNPT Outlet Type FNPT Inlet Size 3/4 in Outlet Size 3/4 in Thermostat Length 3 1/16 in Body Height 3 in 500 000 BtuH Factory Set Pressure 150 psi Max Temp 210 Degrees F Shank Length 1-3/16 in Auto Re-Seating Yes Body Material Bronze Spring Material Stainless Steal Body Width 1 5/32 in Standards ANSI Z21.22 CSA 4.4 Compliance ANSI Z21.22/CSA 4.4